Comparison of the diagenetic and reservoir quality evolution between the anticline crest and flank of an Upper Jurassic carbonate gas reservoir, Abu Dhabi, United Arab Emirates

Morad, Daniel; Nader, Fadi H.; Gasparrini, Marta; Morad, S.; Rossi, Carlos; Marchionda, Elisabetta; Darmaki, Fatima Al; Martines, Marco; Hellevang, Helge

doi:10.1016/j.sedgeo.2018.02.008

Cited by 38 publications

(20 citation statements)

References 66 publications

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“…This complex relationship between fracturing, stylolitization, and dolomite cementation may be caused by multiple phases of tectonic movements. The cross-cutting of low amplitude seams by high amplitude stylolites in conglomerate/breccia samples could be a result of increasing compressive stress by tectonic movements generated during the obduction of Oman ophiolites [47,48]. The presence of dolomite cement (T h up to 190 • C; salinity up to 20.8 wt% NaCl eq.)…”

Section: Discussionmentioning

confidence: 99%

Origin of Drusy Dolomite Cement in Permo-Triassic Dolostones, Northern United Arab Emirates

Mansurbeg

Alsuwaidi

Dong

et al. 2021

Water

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While the characteristics and origin of drusy calcite cement in carbonate deposits is well constrained in the literature, little attention is paid to drusy dolomite cement. Petrographic observations, stable isotopes, and fluid-inclusion microthermometry suggest that drusy dolomite cement in Permo-Triassic conglomerate/breccia dolostone beds in northern United Arab Emirates has precipitated as cement and not by dolomitization of drusy calcite cement. The low δ18OVPDB (−9.4‰ to −6.2‰) and high homogenization temperatures of fluid inclusions in drusy dolomite (Th = 73–233 °C) suggest that dolomitization was caused by hot basinal brines (salinity = 23.4 wt% NaCl eq.). The δ13CVPDB values (+0.18‰ to +1.6‰) and 87Sr/86Sr ratio (0.708106 to 0.708147) indicate that carbon and strontium were derived from the host marine Permo-Triassic carbonates. Following this dolomitization event, blocky calcite (Th = 148 °C; salinity = 20.8 wt% NaCl eq.) precipitated from the hot basinal brines. Unravelling the origin of drusy dolomite cement has important implications for accurate construction of paragenetic sequences in carbonate rocks and decipher the origin and chemistry of diagenetic waters in sedimentary basins.

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Section: Discussionmentioning

confidence: 99%

Origin of Drusy Dolomite Cement in Permo-Triassic Dolostones, Northern United Arab Emirates

Mansurbeg

Alsuwaidi

Dong

et al. 2021

Water

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“…Hydrocarbon Fluid. The influence of hydrocarbon emplacement on diagenesis is still controversial [46]. Some scholars believe that hydrocarbon-filled pores would hinder the communication between inorganic ions and minerals [47].…”

Section: Meteoricmentioning

confidence: 99%

Coupling Relationship between Multistage Fluid Activity and Reservoir Abnormally High-Porosity Zones in the Songtao–Baodao Region, Qiongdongnan Basin

Chen

Wang

2021

Geofluids

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An abnormally high-porosity zone (AHPZ) is beneficial for petroleum exploration, especially for the deep tight reservoirs in a petroliferous basin. Because of lacking effective research methods, it is hard to analyze the formation process of AHPZs in different geological periods. From the perspective of the diagenetic fluid type and activity history, geochemical characteristics and fluid inclusions of diagenetic minerals were utilized to reconstruct the diagenetic fluid type and dynamic evolution. The ultimate goal is to study the genetic process of AHPZs in the Songtao–Baodao region of the Qiongdongnan basin, South China Sea. It was found that there are three sections of AHPZs at different burial depths, which are generally favorable for high-quality reservoirs. Moreover, it can be concluded that the AHPZs are closely related to multiple actions of various diagenetic fluids. The meteoric waters, organic acid, and thermal fluids facilitated the enlargement of porosity by dissolving minerals to form secondary pore spaces. The hydrocarbon fluids have positive effects on the preservation of pores by preventing cement from filling the pore space.

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“…The shallow-water marine platform deposits of the Arab Formation (Kimmeridgian to Tithonian) in Abu Dhabi hydrocarbon fields are composed of carbonates and intercalated anhydrite deposits (Fig. 1C; Morad et al, 2012;Marchionda et al, 2018;Morad et al, 2018).…”

Section: Geological Settingmentioning

confidence: 99%

“…This study uses integrated analyses (petrography, isotope, fluid inclusion microthermometry and Raman spectroscopy) of diagenetic minerals in the Arab Formation reservoir from four wells in order to constrain: (1) timing, extent, conditions and distribution of TSR; and (2) why TSR is limited while the H 2 S concentrations are high. (C) Simplified stratigraphy of the Arab Formation onshore Abu Dhabi (Morad et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Limited thermochemical sulfate reduction in hot, anhydritic, sour gas carbonate reservoirs: The Upper Jurassic Arab Formation, United Arab Emirates

Morad

Nader

Morad

et al. 2019

Marine and Petroleum Geology

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Comparison of the diagenetic and reservoir quality evolution between the anticline crest and flank of an Upper Jurassic carbonate gas reservoir, Abu Dhabi, United Arab Emirates

Cited by 38 publications

References 66 publications

Origin of Drusy Dolomite Cement in Permo-Triassic Dolostones, Northern United Arab Emirates

Origin of Drusy Dolomite Cement in Permo-Triassic Dolostones, Northern United Arab Emirates

Coupling Relationship between Multistage Fluid Activity and Reservoir Abnormally High-Porosity Zones in the Songtao–Baodao Region, Qiongdongnan Basin

Limited thermochemical sulfate reduction in hot, anhydritic, sour gas carbonate reservoirs: The Upper Jurassic Arab Formation, United Arab Emirates

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